Source : Webster's Revised Unabridged Dictionary (1913)

Oftentimes \Of"ten*times`\, adv. [Often + time. Cf. {-wards}.]
   Frequently; often; many times. --Wordsworth.

Source : WordNet®

oftentimes
     adv : many times at short intervals; "we often met over a cup of
           coffee" [syn: {frequently}, {often}, {oft}, {ofttimes}]
           [ant: {rarely}, {infrequently}]